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Vertebrates -- 

have a backbone
They have bilateral symmetry and endoskeltons

3 classes of fish - 
     1. Jawless - Lamprey, hagfish. flexible nervous system, suck in food
     2. Cartilaginous -Sharks , skates, and rays - has cartilage instead of bone
     3. Bony Fish - has nerve cord by bone, balloon like swimmers, moving flaps, paired fins
Flexible nervous system

Frogs, salamanders, 
animals that spend part of life in water and part on land
Frog starts as tadpole them develops into frog as it matures. 

7,000 different kinds
true land animals with one or two lungs
They have thick. scaly, waterproof skin
include lizards, snakes, turtles, alligators, crocodiles
Do not generate body heat
cold blooded animals


Have two legs and two wings
have hollow bones to reduce their weight
strong and light
warm blooded animals

Key characteristics:  milk, hair, and large brains
Produce milk to feed their young
most have hair or fur
warm blooded
3 kinds of Mammals
1. Monotremes - lays eggs, duckbilled platypus, spiny anteater
2. Marsupial - pouched animal, kangaroos, koala bears
3. Placental Mammal -young develops inside mammal ; humans, dogs, tigers, elephants, whales

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